AutoCAD DWG Viewer is a free application from Autodesk that allows you to open and view DWG files (the native file format of AutoCAD). It doesn[SQ]t allow you to *edit* the DWG files, only view them. This makes it useful for :

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Sharing and collaborating:

Sending drawings to clients or colleagues who don[SQ]t have AutoCAD installed. They can see the design but can[SQ]t accidentally make changes.
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Quick reference:

Quickly checking the contents of a DWG file without needing the full AutoCAD software.
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Archiving:

Storing and viewing DWG files without the need for a full CAD software license.

Essentially, it[SQ]s a lightweight viewer designed for those who need to see DWG drawings but not modify them. It offers basic viewing functionalities like zooming, panning, and navigating through sheets, but lacks the powerful editing tools found in the full AutoCAD software.